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Nano Research 2022年第3期15卷 1934-1941页

作者： Ge Ma Na Yang Guofu Zhou Xin Wang South China Academy of Advanced Optoelectronics and International academy of optoelectronics at Zhaoqing South China Normal UniversityGuangzhou 510631China

The glycerol electro-oxidation reaction(GEOR)is a green and promising method for the glyceraldehyde production.In this work,Pd nanocrystals(Pd-NCs)modified ultrathin NiO nanoplates(NiO-uNPs)hybrids(Pd-NCs/NiO-uNPs)are successfully synthesized using successive cyanogel hydrolysis,chemical reduction,and calcination treatment methods.Various electrochemical measurements and physicochemical characterization results demonstrate that Pd-NCs/NiO-uNPs hybrids have excellent electrocatalytic performance for both GEOR and hydrogen evolution reaction(HER)in alkaline medium,which benefit from the large specific surface area,uniform distribution of Pd-NCs,and the modified electronic structure of Ni atoms.At Pd-NCs/NiO-uNPs hybrids,only 1.43 V is needed to obtain the current density of 100 mA∙cm^(−2) for GEOR,much lower than that for oxygen evolution reaction(1.82 V).In addition,Pd-NCs/NiO-uNPs hybrids exhibit better HER performance than commercial Pd/C electrocatalyst.As a result,the constructed Pd-NCs/NiO-uNPs||Pd-NCs/NiO-uNPs glycerol electrolyzer only requires 1.62 V electrolysis voltage to reach 10 mA∙cm^(−2) current density,showing an energy-efficient and economy-competitive synthesis for the coproduction of glyceraldehyde and hydrogen.

关键词： NiO nanoplates Pd nanocrystals synergistic effect glycerol electro-oxidation reaction hydrogen evolution reaction

Urea electrooxidation-boosted hydrogen production on nitrogen-doped porous carbon nanorod-supported nickel phosphide nanoparticles

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Journal of Energy Chemistry 2022年第9期31卷 88-96,I0003页

作者： Xiaoyu Zhang Ge Ma Lingling Shui Guofu Zhou Xin Wang South China Academy of Advanced Optoelectronics&International academy of optoelectronics at Zhaoqing South China Normal UniversityGuangzhou 510631GuangdongChina

Urea electro-oxidation reaction(UEOR)-boosted water electrolysis can supplant the kinetics-restricted oxygen evolution reaction(OER)and provide an energy-saving method of hydrogen generation.However,low UEOR activity and the poisoning issue of the catalyst limit its practical application.Herein,a simple coordination reaction is used to synthesize the dimethylglyoxime-NiⅡcomplex(DMGNiⅡ),which efficiently serves as the initial precursor to synthesize nitrogen-doped carbon nanorodsupported nickel phosphide nanoparticle(Ni_(2)P/N-C)nanocomposites.The density functional theory calculations and electrochemical results reveal that nitrogen doping can weaken the adsorption of hydrogen and the generated CO_(2)resulting in an enhancement of hydrogen evolution reaction(HER)and UEOR activity.In addition,N-doping can also promote the generation of Ni,which can further promote the UEOR and HER performance.Concretely,the overpotential for the HER on Ni_(2)P/N-C-2h nanocomposites is only 201 m V at 10 mA cm,and the onset potential of the UEOR on NiP/NC-2h nanocomposites is only 1.34 V.Additionally,the Ni_(2)P/N-Cnanocomposites also show excellent long-term stability due to the introduction of nitrogen-doped carbon material.Consequently,the symmetric Ni_(2)P/N-C-2h||Ni_(2)P/N-C-2h urea electrolyzer requires 1.41 V of electrolysis voltage for urea electrolysis,which can be applied in energy-saving H_(2) production and environment purification.

关键词： Electrochemical water splitting Nitrogen-doped carbon Nickel phosphide nanoparticles Urea oxidation reaction Electrolysis voltage

Tracking lithiation with transmission electron microscopy

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Science china Chemistry 2024年第1期67卷 291-311页

作者： Xincheng Lei Jianxiong Zhao Jiayi Wang Dong Su Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China South China Academy of Advanced Optoelectronics&International academy of optoelectronics at Zhaoqing South China Normal UniversityGuangzhou 510006China

Li-ion batteries(LIBs)have dominated energy-storage techniques for portable electronic devices and electric cars,and are expanding their territory into the large-scale energy storage.The energy storage of LIBs is realized by the reversible shuttle of lithium ions between electrodes.It is essential to track the lithium diffusion and obtain a profound insight into the lithiation mechanism during the work cycle of LIBs.Transmission electron microscopy(TEM)is a powerful tool for the structural characterization,which can provide the information about the lithiation at the atomic scale.In this review,we summarize the research frontiers of TEM applications on LIBs.We introduce the techniques for the direct observation of Li species in LIB-related materials.Especially,the application of cryo-TEM is highlighted.Moreover,in-situ TEM technique is further discussed since it shows great advantages in studying the dynamical structure changes of LIBs.The perspectives and strategies in this review offer feasible guidance for researchers to further improve the performance of LIBs.

关键词： lithium-ion battery electrode materials transmission electron microscopy cryo-TEM in-situ TEM

HfO_(2)铁电薄膜基MFIS存储结构中的高κ介电晶籽层效应研究:铁电正交相生长和界面电荷注入抑制

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Science china Materials 2023年第1期66卷 219-232页

作者：张岩王岛王佳丽罗春来李明李育珊陶瑞强陈德扬樊贞戴吉岩周国富陆旭兵刘俊明 Institute for advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics and National Center for International Research on Green OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Laboratory of Solid State Microstructures and Innovation Center of advanced Microstructures Nanjing UniversityNanjing 210093China

HfO_(2)基材料铁电场效应晶体管(FeFET)商业化应用面临的一个重要挑战是其疲劳特性差.本文提出,在基于金属-铁电-绝缘层-半导体(MFIS)栅叠层结构的FeFET中研发合适的高κ界面晶籽层(SL)以大幅度提升其疲劳性能.我们在ZrO_(2),HfO_(2),(H... 详细信息

HfO_(2)基材料铁电场效应晶体管(FeFET)商业化应用面临的一个重要挑战是其疲劳特性差.本文提出,在基于金属-铁电-绝缘层-半导体(MFIS)栅叠层结构的FeFET中研发合适的高κ界面晶籽层(SL)以大幅度提升其疲劳性能.我们在ZrO_(2),HfO_(2),(HfO_(2))0.75(Al_(2)O_(3))0.25(HAO)和Al_(2)O_(3)等典型的高κ介电SL上制备了Hf_(0.5)Zr_(0.5)O_(2)(HZO)铁电薄膜,系统研究了HZO薄膜的微观结构、铁电性及其MFIS器件的存储特性.首先,揭示了HZO薄膜中铁电正交相的形核和生长不仅受高κ介电SL表面能的影响,而且其微观结构对HZO中正交相的形成也起到重要作用.其次,澄清了高κ介电晶籽层对MFIS结构存储特性的影响,通过精确计算的MFIS结构的界面层电场,对MFIS结构的存储特性做出了合理解释.最后,基于HAO的高κSL的MFIS器件实现了铁电极化和界面电荷注入之间的合理优化,并且获得了较大铁电存储窗口(>1.0 V),出色的保持特性(>1.6×104s)和疲劳特性(>105).本文为未来解决HfO_(2)基Fe FET的疲劳问题提供了有价值的思路,为在介电SL上生长HfO_(2)铁电薄膜的其他高性能电子器件的开发提供了参考.

关键词：存储特性存储结构铁电薄膜商业化应用 MFIS 铁电存储疲劳特性叠层结构

基于迁移光子雪崩效应的单束低功率激光三维多色超分辨显微成像技术

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Science Bulletin 2024年第4期69卷 458-465页

作者：朱志旻梁宇森赵琪吴蕙潘彬雄乔书倩王保举詹求强 Centre for Optical and Electromagnetic Research Guangdong Engineering Research Centre of Optoelectronic Intelligent Information PerceptionSouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China

The development of super-resolution fluorescence microscopy is very essential for understanding the physical and biological fundamentals at nanometer scale.However,to date most super-resolution modalities require either complicated/costly purpose-built systems such as multiple-beam architectures or complex post-processing procedures with intrinsic artifacts.Achieving three-dimensional(3D)or multi-channel sub-diffraction microscopic imaging using a simple method remains a challenging and struggling task.Herein,we proposed 3D highly-nonlinear super-resolution microscopy using a singlebeam excitation strategy,and the microscopy principle was modelled and studied based on the ultrahigh nonlinearity enabled by photon avalanches.According to the simulation,the point spread function of highly nonlinear microscopy is switchable among different modes and can shrink three-dimensionally to sub-diffraction scale at the photon avalanche mode.Experimentally,we demonstrated 3D optical nanoscopy assisted with huge optical nonlinearities in a simple laser scanning configuration,achieving a lateral resolution down to 58 nm(λ/14)and an axial resolution down to 185 nm(λ/5)with one single beam of low-power,continuous-wave,near-infrared laser.We further extended the photon avalanche effect to many other emitters to develop multi-color photon avalanching nanoprobes based on migrating photon avalanche mechanism,which enables us to implement single-beam dual-color sub-diffraction super-resolution microscopic imaging.

关键词： Super-resolution microscopy Nonlinear optics Upconversion nanoparticles Photon avalanches

Unraveling the mechanism of potassium metal capacitor for highly efficient charge storage

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Science china Chemistry 2024年第5期67卷 1578-1588页

作者： Qianqian Yao Pei Tang Kunyao Peng Zhenyuan Miao Yuecong Chen Qingyun Dou Xingbin Yan Department of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China South China Academy of Advanced Optoelectronics South China Normal UniversityGuangzhou 510006China

Although hybrid metal ion capacitors(MICs) are highly desired to achieve both high power density of supercapacitors and high energy density of rechargeable batteries, the mismatch problem of electrochemical kinetics of negative and positive electrodes in MICs hampers the realization of this goal. Here, a new hybrid capacitor concept-potassium metal capacitor(PMC) is proposed for the first time, where potassium metal and commercial activated carbon(AC) without any modification are applied as negative and positive electrodes, respectively, and the electrolyte is the same as that of non-aqueous potassium ion batteries. The simplest PMC prototype exhibits a good combination of high energy density(184.9 Wh kg^(-1)) and power density(12.4 kW kg^(-1)), which benefits from the synergistic effect of potassium metal and AC electrode. The former experiences fast potassium plating/striping during charging and discharging, and the later possesses complex multiple charge behaviors driven by low potential of potassium metal. Specifically, below open-circuit voltage, transportation of solvated cations in AC pores plays an important role;beyond this voltage, synergy actions of cations and anions, including adsorption/desorption of solvated cations and anions, and ions exchange between them, dominate the capacitance contribution. This work enriches the types of MICs, and deepens the understanding of the energy storage mechanism of non-aqueous hybrid metal capacitors.

关键词： hybrid capacitor potassium metal activated carbon charge storage mechanism

Upconversion nanoscopy revealing surface heterogeneity of tumor-secreted extracellular vesicles

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Light(Science & Applications) 2023年第4期12卷 502-504页

作者： Rui Pu Qiuqiang Zhan Centre for Optical and Electromagnetic Research South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China

Super-resolution microscopic imaging employing upconversion nanoparticles is applied to reveal the surface heterogeneity of tumor cell-derived small extracellular vesicles,i.e.,exosome.The number of surface antigens of every extracellular vesicles can be quantified by both the high imaging resolution and stable brightness of upconversion nanoparticles.This method proves its great potential in nanoscale biological studies.

关键词： surface resolution revealing

Sr-doping effects on conductivity,charge transport,and ferroelectricity of Ba_(0.7)La_(0.3)TiO_(3) epitaxial thin films

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Chinese Physics B 2021年第2期30卷 514-519页

作者：李强王岛张岩李育珊张爱华陶瑞强樊贞曾敏周国富陆旭兵刘俊明 Institute for advanced Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Optical Information Materials South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China National Center for International Research on Green optoelectronics South China Normal UniversityGuangzhou 510006China Laboratory of Solid State Microstructures and Innovation Center of advanced Microstructures Nanjing UniversityNanjing 210009China

Sr-doped Ba_(0.7)La_(0.3)TiO_(3)(BSLTO)thin films are deposited by pulsed laser deposition,and their microstructure,conductivity,carrier transport mechanism,and ferroelectricity are systematically investigated.The x-ray diffraction measurements demonstrate that Sr-doping reduces the lattice constant of BSLTO thin films,resulting in the enhanced phonon energy in the films as evidenced by the Raman measurements.Resistivity-temperature and Hall effect measurements demonstrate that Sr can gradually reduce electrical resistivity while the electron concentration remains almost unchanged at high temperatures.For the films with semiconducting behavior,the charge transport model transforms from variable range hopping to small polaron hopping as the measurement temperature increases.The metalic conductive behaviors in the films with Sr=0.30,0.40 conform to thermal phonon scattering mode.The difference in charge transport behavior dependent on the A-site cation doping,is clarified.It is revealed that the increasing of phonon energy by Sr doping is responsible for lower activation energy of small polaron hopping,higher carrier mobility,and lower electrical resistivity.Interestingly,the piezoelectric force microscopy(PFM)results demonstrate that all the BSLTO films can exhibit ferroelectricity,especially for the room temperature metallic conduction film with Sr=0.40.These results imply that Sr-doping could be a potential way to explore ferroelectric metal materials for other perovskite oxides.

关键词： Sr-doping transport mechanism BSLTO thin film ferroelectric metal

HfO铁电薄膜基MFIS存储结构中的高κ介电晶籽层效应研究:铁电正交相生长和界面电荷注入抑制(英文)

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Science china Materials 2022年

作者：张岩王岛王佳丽罗春来李明李育珊陶瑞强陈德扬樊贞戴吉岩周国富陆旭兵刘俊明 Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South ChinaNormal University Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics and National Center for International Research on Green Optoelectronics South China Normal University Institute for advanced Materials South China Academy of Advanced Optoelectronics South China Normal University Department of Applied Physics The Hong Kong Polytechnic University Laboratory of Solid State Microstructures and Innovation Center of advanced Microstructures Nanjing University

HfO基材料铁电场效应晶体管(FeFET)商业化应用面临的一个重要挑战是其疲劳特性差. 本文提出, 在基于金属-铁电-绝缘层-半导体(MFIS)栅叠层结构的FeFET中研发合适的高κ界面晶籽层(SL)以大幅度提升其疲劳性能. 我们在ZrO, HfO, (HfO)(AlO...

HfO基材料铁电场效应晶体管(FeFET)商业化应用面临的一个重要挑战是其疲劳特性差. 本文提出, 在基于金属-铁电-绝缘层-半导体(MFIS)栅叠层结构的FeFET中研发合适的高κ界面晶籽层(SL)以大幅度提升其疲劳性能. 我们在ZrO, HfO, (HfO)(AlO)(HAO)和AlO等典型的高κ介电SL上制备了HfZrO(HZO)铁电薄膜, 系统研究了HZO薄膜的微观结构、铁电性及其MFIS器件的存储特性. 首先, 揭示了HZO薄膜中铁电正交相的形核和生长不仅受高κ介电SL表面能的影响, 而且其微观结构对HZO中正交相的形成也起到重要作用. 其次,澄清了高κ介电晶籽层对MFIS结构存储特性的影响, 通过精确计算的MFIS结构的界面层电场, 对MFIS结构的存储特性做出了合理解释. 最后, 基于HAO的高κ SL的MFIS器件实现了铁电极化和界面电荷注入之间的合理优化, 并且获得了较大铁电存储窗口(>1.0 V), 出色的保持特性(>1.6 × 10~4s)和疲劳特性(>10~5). 本文为未来解决HfO基FeFET的疲劳问题提供了有价值的思路, 为在介电SL上生长HfO铁电薄膜的其他高性能电子器件的开发提供了参考.

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Fast UV-vis-NIR photoresponse of self-oriented F_(16)CuPc nanoribbons

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Nano Research 2023年第7期16卷 9561-9568页

作者： Lingyu Zhang Xingyu Wang Wei Zhou Hao Wang Jiaxun Song Zihao Zhao Jihui Liao Jian Song Yajun Li Jinyou Xu Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Department of Materials and Interfaces Weizmann Institute of ScienceRehovot 76100Israel

Controlling the vapor-deposited nanoribbons to grow along a consistent orientation will enable the desired in situ integration of functional devices,representing a major technological advance compared to post-growth processing strategies.In this work,ntype F_(16)CuPc molecules are self-assembled into horizontally-oriented nanoribbons with a consistent growth axis after creating periodic hydrophobic nanogrooves on a sapphire surface.Consequently,electrodes are deposited directly on the growth substrate to enable in situ fabrication of photodetectors.Depending on the deposited electrodes,these horizontally-oriented nanoribbons are connected to form a monolithic photodetector with a large sensing area or an on-chip array of photodetectors with multiple detector units.This in situ integration strategy avoids potential structural damage and contamination from impurities associated with post-growth processing steps.Therefore,the vapor-deposited nanoribbons can retain their high quality during the device manufacturing process,which contributes to performance improvement.As a result,the in-situ integrated F_(16)CuPc photodetectors exhibit a sensitive response in the ultraviolet-visible-near-infrared(UV-vis-NIR)region.The response time is on the order of tens of milliseconds,the fastest record ever for the F_(16)CuPc-based photodetectors.Furthermore,statistics from an array of 6×6 photodetectors show little variation in their sensitivity and response time,and hence this in situ fabrication scheme will contribute to the implementation of on-chip integrated photodetectors with consistent performance based on bottom-up nanoribbons.Overall,this self-oriented growth provides a versatile option to achieve desired in-situ integrated functional devices based on bottom-up nanoribbons.

关键词： fluorinated copper phthalocyanine nanoribbon planar array photodetector in situ integration